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Understanding the Linux shell
When it comes to the Linux shell, it's important to understand what exactly the term 
pertains to. We've been using the command line repeatedly throughout the book, but 
we haven't yet had any formal discussion about the actual interface through which 
our commands are entered.
Essentially, we've been entering our commands into a command interpreter known 
as the 
Bourne Again Shell
, or simply 
Bash
. Bash is just one of many different 
shells
 that you can use to enter commands. There are other options, including